355 lt1 Deck ?
Thread Starter
On The Tree
Joined: Dec 2009
Posts: 120
Likes: 0
From: Douglas, WY
355 lt1 Deck ? Well i just got my short block back and i had them zero deck it. Am i gonna have any issues with my intake sealing? heads arent even done yet and they will be milled for sure! Any info guys?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo We took less than .015" off the LE2 heads (I bought them used and had then freshened)
My Darts were intentionally milled to reduce chamber size to 56cc.
I prefer to minimal deck my block so I can do more than one rebuild because if a head gasket ever blows you know the heads are going to have to be shaved. I like to use head gasket thickness to setup my quench.
How can you do this without a zero deck? If you leave the piston in the hole the minimum head gasket you can get is a .029 plus whats in the hole. The tighter the quench the better. Optimum is mid .030's.
My heads are milled .030, with .026 head gaskets and the 355 deck was cleaned up about .005-.010 Guy I bought the motor just said they were cleaned up. The speed pro pistons all sat about .010 in the hole. I had to drill out and angle the intake bolt holes for it to seat right. Hope this helps
I have had more LT1 heads/cam setups than most but the block is not too much of a problem with the intake it's the heads being milled that affects the intake ports not lining up just right. I always just take the gasket off and see how well the intake fits w/o any intake gasket, if it lines up perfect then you need to take the thickness of the intake gasket off the intake, somewhere in between or have the heads cut to match which is difficult. You can't hardly see .030 so if the boltholes don't line up just right then that needs to be addressed. I had to mill .060 off one of my intake to make it fit right but that was with a set of angle milled Trickflows. On my current 383, I had to mill .030 off the intake to get it to fit just right. Once you start moddifying the engine nothing fits just perfect so it's up to the builder or you to make it fit just right. These are a couple reasons why some LT1's run really strong and some have lackluster results. Just because the bolts line up ok doesn't mean your ports are lined up perfect. Later Clint
TECH Enthusiast
Joined: Nov 2005
Posts: 520
Likes: 0
That's almost what we did to mine .005 in the hole with .027 cometics//////daily driven 355...
The machine work was so reasonable that I'll never slot intake bolt holes again....
Mike
Last edited by aboatguy; Dec 23, 2009 at 11:49 AM.
Thread Starter
On The Tree
Joined: Dec 2009
Posts: 120
Likes: 0
From: Douglas, WY
Thanks for the info guys, Im gonna get all the specs on how much has been removed, An seems i have a handy bore scope im gonna mount the intake up and see how much its off at the ports
